// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef V8_INSPECTOR_WASM_TRANSLATION_H_
#define V8_INSPECTOR_WASM_TRANSLATION_H_

#include <unordered_map>

#include "include/v8.h"
#include "src/base/macros.h"
#include "src/debug/debug-interface.h"
#include "src/inspector/string-16.h"

namespace v8_inspector {

// Forward declarations.
class V8DebuggerAgentImpl;

class WasmTranslation {
public:
    explicit WasmTranslation(v8::Isolate* isolate);
    ~WasmTranslation();

    // Make a wasm script known to the translation. This will trigger a number of
    // didParseScript calls to the given debugger agent.
    // Only locations referencing a registered script will be translated by the
    // Translate functions below.
    void AddScript(v8::Local<v8::debug::WasmScript> script,
        V8DebuggerAgentImpl* agent);

    // Clear all registered scripts.
    void Clear();

    // Clear all registered scripts for context group.
    void Clear(v8::Isolate* isolate, const std::vector<int>& contextIdsToClear);

    // Translate a location as generated by V8 to a location that should be sent
    // over protocol.
    // Does nothing for locations referencing a script which was not registered
    // before via AddScript.
    // Line and column are 0-based.
    // Returns true if the location was translated, false otherwise.
    bool TranslateWasmScriptLocationToProtocolLocation(String16* script_id,
        int* line_number,
        int* column_number);

    // Translate back from protocol locations (potentially referencing artificial
    // scripts for individual wasm functions) to locations that make sense to V8.
    // Does nothing if the location was not generated by the translate method
    // above.
    // Returns true if the location was translated, false otherwise.
    bool TranslateProtocolLocationToWasmScriptLocation(String16* script_id,
        int* line_number,
        int* column_number);

    const String16& GetSource(const String16& script_id, int func_index);
    int GetStartLine(const String16& script_id, int func_index) { return 0; }
    int GetStartColumn(const String16& script_id, int func_index) { return 0; }
    int GetEndLine(const String16& script_id, int func_index);
    int GetEndColumn(const String16& script_id, int func_index);
    String16 GetHash(const String16& script_id, int func_index);

private:
    class TranslatorImpl;
    friend class TranslatorImpl;

    void AddFakeScript(const String16& scriptId, TranslatorImpl* translator);

    v8::Isolate* isolate_;
    std::unordered_map<int, std::unique_ptr<TranslatorImpl>> wasm_translators_;
    std::unordered_map<String16, TranslatorImpl*> fake_scripts_;

    DISALLOW_COPY_AND_ASSIGN(WasmTranslation);
};

} // namespace v8_inspector

#endif // V8_INSPECTOR_WASM_TRANSLATION_H_
